Can someone explain the golden ratio plz and ty

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Taylor wants to paint his rectangular deck that is 41 feet long and 24 feet wide. a gallon of paint covers about 350 square feet. how many gallons of paint will taylor need to cover the entire deck? round your answers to two decimal places when necessary.

Simplify. 3(4+4x) (type your answer in with no spaces)